Oxfordshire · England
Lower Basildon External Mastic
Movement joints in Lower Basildon need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
- Joints pointed up with cement by mistake
How it works
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Lower Basildon, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Let us know about parking restrictions
- Mention any tricky access
- Try not to wet indoor joints just before the visit
Getting a quote
To get a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear price before any work starts.
Advice
External mastic for homes and businesses in Lower Basildon
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. If you have water getting into walls through failed joints and weeds or debris growing in open joints, we can help.
Outside joints can only be sealed when they’re dry, so work in Lower Basildon is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Every job comes with a one-year guarantee.
- Place
- Lower Basildon (RG8)
- Region
- Oxfordshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Lower Basildon
Also in Lower Basildon
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Render that is blown, hollow or coming away
- Adding movement joints to masonry that has none
- Damp that is not coming from the joint
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think.
Surfaces we seal
- Concrete & block
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together and it means sorting access once. Older cottages and farmhouses around Lower Basildon can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Why book with us
- Every job guaranteed for a year
- Sanitary silicone with an anti-fungal additive in wet areas
- 180+ five-star Google reviews
- You choose the colour before work begins
Read what affects the cost or what customers say.
Lower Basildon questions
Do you cover Lower Basildon for external mastic?
Yes, Lower Basildon is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing.
Is Lower Basildon within the area you cover?
Yes. Lower Basildon is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
What is a movement joint?
Walls move with heat, cold and moisture, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
Is there a guarantee?
Yes. There’s a 12-month guarantee on every job, wherever you are.
Where are you based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Aftercare tips
To keep the joints looking good and working properly:
- Ask before painting over external sealant
- Keep movement joints as flexible joints, not mortar
- Keep water from gutters off the wall
- Look over the joints every year, ideally after winter
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What we’re called out for in Lower Basildon
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
If you can see any of these, it’s time to have the joints looked at:
- Weathered mastic that no longer stretches
- Cracked joints where brick meets render or frames
- Joints with sealant missing in places
- Weeds or debris growing in open joints
If you live in an older home near St Bartholomew's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What your quote should include
- Who does the work, and how experienced they are
- Whether they’re fully insured
- How the surfaces are prepared before sealing
- Is VAT in the price?
For landlords and businesses
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Outside joints around Lower Basildon
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Basildon Park (about 0.3 miles south) nearby, there’s older building stock in the area around Lower Basildon as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you let a flat or house near Goring & Streatley station, outside joints that have cracked can let damp into a rental, so check them between lets.
Lower Basildon is about 7 miles west of Caversham, in Oxfordshire. Homes, rented property, offices and hotels in Lower Basildon can book us for external mastic, old or new, large or small. The work is guaranteed for a year. Our Oxfordshire coverage runs to 443 places, and Lower Basildon is one of them. Reading is on our list too, about 7 miles from Lower Basildon.
All of RG8 is covered for external mastic. Nearby, we also carry out external mastic in Goring (2 miles north), Elvendon (2 miles north-east), Streatley (2 miles north-west), South Stoke (3 miles north) and Hungerford Green (3 miles west). Within a short drive, we also cover Didcot (9 miles north-west), Abingdon-on-Thames (14 miles north-west), Wantage (14 miles north-west), Henley-on-Thames (9 miles east), Grove (15 miles north-west) and Benson (8 miles north).
Near you in Lower Basildon
In Lower Basildon, that means homes and buildings near The Old Tavern and the streets around them. For rail, the closest station is Goring & Streatley station, roughly 1.4 miles north-west. Other landmarks nearby include Yattendon Castle (4.4 miles south-west). Not far away are Hartslock.